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Fair Values of Assets and Liabilities Textuals (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2008
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Securities available for sale |
$ 235,199,000,000 |
$ 222,613,000,000 |
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| Net unrealized gains on trading securities |
305,000,000 |
133,000,000 |
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| Mortgages held for sale |
42,305,000,000 |
44,791,000,000 |
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| Loans |
799,574,000,000 |
769,631,000,000 |
757,267,000,000 |
782,770,000,000 |
864,830,000,000 |
| Capital Lease Obligation |
12,000,000 |
116,000,000 |
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| Loan charge-offs |
10,973,000,000 |
13,615,000,000 |
20,100,000,000 |
19,825,000,000 |
8,777,000,000 |
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US States and Political Subdivisions [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Fair Value Disclosure, Transfers from Level 3 to Level 2 |
9,400,000,000 |
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Trading Account Assets Other [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Fair Value Disclosure, Transfers from Level 2 to Level 1 |
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709,000,000 |
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Private Equity Funds [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Liquidation period |
8 years |
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Venture Capital Funds [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Liquidation period |
5 years |
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Private Equity Funds, Foreign [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Redemption restriction for investment |
189,000,000 |
200,000,000 |
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Lease Financing [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Loans |
12,424,000,000 |
13,117,000,000 |
13,094,000,000 |
14,210,000,000 |
15,829,000,000 |
| Loan charge-offs |
24,000,000 |
38,000,000 |
120,000,000 |
229,000,000 |
65,000,000 |
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Non modified loans [Member] | Maximum [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Cost to service per loan |
437 |
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Non modified loans [Member] | Minimum [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Cost to service per loan |
90 |
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Residential [Member] | Government Insured Or Guaranteed [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Mortgages held for sale |
942,000,000 |
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Residential [Member] | Non Government Insured Or Guaranteed [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Mortgages held for sale |
103,000,000 |
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Consumer [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Loans |
438,376,000,000 |
424,181,000,000 |
435,209,000,000 |
446,305,000,000 |
474,866,000,000 |
| Loan charge-offs |
8,959,000,000 |
10,819,000,000 |
14,667,000,000 |
14,261,000,000 |
6,607,000,000 |
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Consumer [Member] | Loans discharged in bankruptcy [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Loan charge-offs |
888,000,000 |
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| Financing Receivable, Fair Value, Nonaccrual Status |
2,000,000,000 |
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Collateralized loan obligations [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Total trading assets (excluding derivatives) |
721,000,000 |
583,000,000 |
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| Securities available for sale |
12,500,000,000 |
8,100,000,000 |
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| Trading and available for sale securities |
13,300,000,000 |
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Available for sale Securities [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Fair Value Disclosure, Transfers from Level 3 to Level 2 |
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4,900,000,000 |
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| Fair Value Disclosure, Transfers from Level 2 to Level 3 |
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502,000,000 |
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| Significant Transfers Into Level 3, Amount |
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829,000,000 |
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| Significant Transfers Out of Level 3, Amount |
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1,900,000,000 |
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Available for sale Securities [Member] | Debt Securities [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Fair Value Disclosure, Transfers from Level 3 to Level 2 |
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801,000,000 |
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| Fair Value Disclosure, Transfers from Level 2 to Level 3 |
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1,700,000,000 |
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Trading Securities [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Significant Transfers Out of Level 3, Amount |
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276,000,000 |
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Mortgage servicing rights [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Significant Transfers Out of Level 3, Amount |
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118,000,000 |
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Long-term debt [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Significant Transfers Into Level 3, Amount |
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359,000,000 |
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Loans [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Significant Transfers Into Level 3, Amount |
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366,000,000 |
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Carrying amount [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Loan Commitments And Standby, Commercial And Similar Letters of Credit |
586,000,000 |
495,000,000 |
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Estimated fair value [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Loans |
772,351,000,000 |
723,867,000,000 |
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| Loan Commitments And Standby, Commercial And Similar Letters of Credit |
586,000,000 |
495,000,000 |
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Estimated fair value [Member] | Level 1 [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Loans |
0 |
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Estimated fair value [Member] | Level 2 [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Loans |
56,237,000,000 |
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Estimated fair value [Member] | Level 3 [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] |
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| Loans |
$ 716,114,000,000 |
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